Eighteen states and the District of Columbia have passed laws that allow individuals to use marijuana for medical purposes. There is an ongoing heated policy debate over whether these laws have increased marijuana use among non-patients. In this paper, I address that question empirically by...

Medical marijuana laws generate significant policy debates regarding drug policy. In particular, if marijuana is a complement or a gateway drug to hard drugs, these laws would increase not only the usage of marijuana but hard drugs such as cocaine and heroin. In this paper, I empirically study...